Vivado 打包开源IP核并验证 (I2C外设)

有时候下载别人写好的RTL IP,每次挨个连线AXI总线也挺麻烦的,而且也不直观,打包起来再用就方便多了嘛.

我这里打包的是alexforencich大佬写的I2C核,具体地址大家观摩.

https://github.com/alexforencich/verilog-i2c

新建工程并包含主要AXI所用到的三个文件.

菜单Tools->Create and Package New IP,选择Package your current project.

选好一个目录开始打包.

之后就会直接进入IP编辑,其他信息大家自己都明白自己填写了,其中端口是我们最关心的,可以看出他已经自动整理好了,如果我们要编辑某些接口使用条件或者参数,也是可以继续编辑的.

如果为了规范发布,也应该完善其他选项,比如Addressing and Memory把寄存器都填好,方便其他人嘛,还要注意RST的属性是高复位的,然后我就直接打包了.

加到我的bd里,另一个我则是以Add Module形式,自己添加了一个RTL文件,这样适配输出inout口.

接下来还要规划一下地址分布,我这里仅仅测试一下就保持默认了.

具体寄存器分布查看i2c_master_axil.v文件就知道,大佬都把注释写的非常好,

/******************************************************************************
* Copyright (C) 2023 Advanced Micro Devices, Inc. All Rights Reserved.
* SPDX-License-Identifier: MIT
******************************************************************************/
/*
 * helloworld.c: simple test application
 *
 * This application configures UART 16550 to baud rate 9600.
 * PS7 UART (Zynq) is not initialized by this application, since
 * bootrom/bsp configures it to baud rate 115200
 *
 * ------------------------------------------------
 * | UART TYPE   BAUD RATE                        |
 * ------------------------------------------------
 *   uartns550   9600
 *   uartlite    Configurable only in HW design
 *   ps7_uart    115200 (configured by bootrom/bsp)
 */

#include <stdio.h>
#include "platform.h"
#include "xil_printf.h"

#include "xparameters.h"

#define I2C_STATUS   (XPAR_I2C_MASTER_AXIL_0_BASEADDR + 0x00)
#define I2C_COMMAND  (XPAR_I2C_MASTER_AXIL_0_BASEADDR + 0x04)
#define I2C_DATA     (XPAR_I2C_MASTER_AXIL_0_BASEADDR + 0x08)
#define I2C_PRESCALE (XPAR_I2C_MASTER_AXIL_0_BASEADDR + 0x0C)

#define CMD_START    (1<<8)
#define CMD_READ    (1<<9)
#define CMD_WRITE    (1<<10)
#define CMD_WR_M    (1<<11)
#define CMD_STOP    (1<<12)


int main()
{
    uint32_t Reg;

    init_platform();

    *((uint32_t volatile *)(I2C_PRESCALE)) = 150;
    Reg = *((uint32_t volatile *)(I2C_PRESCALE));

    *((uint32_t volatile *)(I2C_COMMAND)) = CMD_START | CMD_WR_M | 0xA0;
    *((uint32_t volatile *)(I2C_DATA)) = 0x0105;
    *((uint32_t volatile *)(I2C_DATA)) = 0x0310;

    *((uint32_t volatile *)(I2C_COMMAND)) = CMD_STOP | 0x50;

    print("Hello World\n\r");
    print("Successfully ran Hello World application");
    cleanup_platform();
    return 0;
}